fix(network): выбрать IPv6-команду в экспорте GRE

docs/ux-ui/acceptance/gre213-profile-2026-10-13.json

@@ -0,0 +1,12 @@
+{
+  "date": "2026-10-13",
+  "block": "12.5.213",
+  "commands": [
+    "npx tsx lib/gre-export.test.ts",
+    "npx tsx backend/src/services/gre-ipv6.test.ts"
+  ],
+  "passed": true,
+  "frontendTypecheckPassed": true,
+  "eslintErrors": 0,
+  "scope": "IPv6 family/static fragment and existing backend IPv6 compatibility; no backend changes"
+}